At a guess, the one speaking at the end is Shun. Not many people know that Wrath killed Yuugo. I really doubt Katia would complain about him being dead though it's possible she might point out the possible contradiction in Wrath's words (but I think this would be unlikely as well as she's quite smart and could likely predict how Wrath would respond).

^ Yeah, it would be interesting to see Shiro take the others for a trip into the labyrinth and show the difference between one's imagination and reality.